by Kastro
Paper/Archive/CVE-2026-39878

CVE-2026-39878

chamilo chamilo-lms — Chamilo stored XSS via user registration leads to admin account takeover

EPSS 0.4%CVSS 9.3
critical.is priorityof 100
36
CVSS 9.3 (CNA)9.3 / 10 × 3027.9Not in CISA KEV+300.0EPSS percentile 37.8.378 × 207.6No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

Chamilo LMS versions 1.11.38 and earlier contain a stored cross-site scripting vulnerability in the user registration form that allows any unauthenticated attacker to execute arbitrary JavaScript in an administrator's browser session, leading to full platform admin account takeover. This has been patched in 1.11.40.

Affected

ProductAffectedFixed inSource
chamilo-lms<= 1.11.38–CNA

Scores by source

GitHub_M (CNA)9.3CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgithub.com/chamilo/chamilo-lms/security/advisories/GHSA-gcjp-f7jm-rrrgrefvokecyber.com/research/cve-2026-39878-chamilo-lms-stored-xss